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        1. 数字时钟 
            2024/03/21   19:13:11

        2. 小广告
            (1) 页面加载完毕 等待5s 小广告显示
            (2) 倒计时10s后关闭小广告
            (3) 重复1-2
            (4) 点击关闭按钮 => 清除小广告 => 重复 1 2 3

    
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